At the movie theatre, child admission is 6.20 and adult admission is $9.90. On Tuesday, four times as many adult tickets as child tickets were sold, for a total sales of $1419.80. How many child tickets were sold that day?

31

Step-by-step explanation:

For every 4 adult tickets sold, only 1 child ticket was sold.  So the cost of 4 adult tickets and 1 child ticket is:

4 x 9.9 + 1 x 6.2 = 45.80

Divide the total sales by 45.80:  1419.80 ÷ 45.80 = 31

So there were 31 lots of "4 adult tickets and 1 child ticket" sold.

Therefore, there were 31 x 4 = 124 adult tickets sold

                              and  31 x 1 = 31 child tickets sold

all it means is function 3

question: how many people can she serve?

answer: she can serve 16.66666667 people. so she can only give 16 people a complete serving.

question: does she have enough ice cream for her guests?

answer: no. explanation: she only has enough for 16 people to have a full serving. however, she can give a 17th person a partial serving.